<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
</head>
<body>
    <ul>
        <li id="a">北京</li>
        <li id="b" class="石家庄">河北</li>
        <li>山东</li>
        <li>浙江</li>
    </ul>
</body>
</html>